Means for fitting up screw-propeller hubs upon their shafts



A. MAIRE.

MEANS FOR FITTING UP SCREW PROPELLER 'HUBS UPON THEIR SHAFTS..

' APPLICATION FILED JAN. 2. 1919. 1

1,346,665. Patented July 13, 1920.

eueusra Mam E, 0F .ARGENTEUIIL, ERA-NOE,

ANCIENS ETABLISSEMENTS DE .DIETRICH -'&- CIE. on L1? FRANCE.

ASSIGN'QR r0 SOCIETE fnonftAiivn Mar us F012. F TTING UP SCREW-FROPELLERnuns UPON mm s'HAFT's;

To all whom it ma concern:

Be it-known thatI, AUGUSTE, MAIRE, citizen of the Republic of France,residing at Route de Bezons, 'Argenteuil, Seine-e't-Oise, in theRepublic" of France, have invented new and useful Improvements inlWIeans for Fitting Up Screw-Propeller Hubs Upon Their Shafts, of whichthe following is a specification.

This invention relates to improved means for fitting up screw propellerhubs upon their shafts, the characteristic feature of 'which is that thelocking of the hub on the shaft as well as its unlocking therefrom areeffected by a nut having a collar which is screwed upon the end of theshaft and bears upon a shoulder piece inside the hub, and by a lock nuthaving a thread reverse to that of the first nut and screwed withinthe'body of the hub, so that when drivenhome, its inner end leaves acertain amount of play between the same and the nut collar; the nut andthe lock nut being pinned together after being screwed on. Thisconstruction allows to effect the unlocking after having first unpinnedthe nuts by merely loosening the first nut which may be done owing tothe play, left between the inner end of the lock nut and the nut collar.

In the accompanying drawings, Figure 1 is a cross section of thisimproved hub.

Fig. 2 is an end view of the same.

Fig. 3 is a View of the lock nut detached.

The hub is in a general way of usual construction. Its bore is a conewhich engages the end of the crank shaft a. The hub is tightened uponthis shaft by a nut I) having a collar 11 a lock nut 0 the thread ofWlllCll'lS reversed to that of the former nut is screwed in the body ofthe hub proper and is provided with a flange 0 in such a manner thatthere may be always a certain amount of play (Z left between the frontend of this look nut-even when screwed homeand the rear part of thecollar 6 of the nut; a stout split pin 6 connects the nut and the locknut together, entering a diametrical hole of the nut and radial notchesformedat the rear end of the lock nut. The nut and the lock nut havingreverse threads, neither of these two pieces can move under the actionof shocks or vibrations.

To unlock, it is suificient to withdraw the pin 6 and to loosen the nutb with a span- Specification of Letters Pa'te'nt. Patented JulApplioation filed January 2, 19i9. ,s ria1 No.-a69,as'5.

7 parts, thenut Z). bjears place abuts her; this I loosening always takeowing to the play (Z; the nut collar tinuing to-act on the screw 6 tounloose'n the 0 upon the thread of the screw propeller shaft on'the onehand and upon the lock nut 0 by its collar on the other hand, so as tocause a longitudinal displacement of the screw propeller hub relativelyto the shaft, thus facilitating the unlocking operation.

The sides or cheeks of the hub are prov ded on their periphery with astiffening rib or collar which prevents them from warping when the boltsare tightened on the screw propeller.

Having now described my invention, what I claim as newand desire tosecure by Letters Patent is:

1. Means for fitting up screw propellers upon their shafts comprising incombination a conical shaft and terminated by a screw threadedcylindrical part, a hub with a conical bore slipped over the end of theconical shaft, a cylindrical bore formed in the hub following the smallbase of the conical bore and having a larger diameter than this base soas to form a shoulder between the two.

bores, a tapping in the cylindrical boreby the side of its outeropening, a nut capable of engaging freely the cylindrical bore of thehub and screwed upon the threaded end of the shaft so as to abut againstthe inner shoulder of the hub, a collar formed upon the front part ofthe nut, a lock nut having a bore of suflicient diameter to slip freelyover the nut, an outer screw thread formed on the front end of thislocknut, this thread being arranged to enter the tapped bore of the huband having a pitch reversed to that of the tapped nut, a flange orabutment formed on the lock nut in such a manner- NEvILLE; or PARIS, i

then against the lock nut 0 and while conas to leave always a certainamount of play i between the front end of the lock nuteven when screwedhomeand the rear of the nut collar and means for pinning together thenut and the lock nut after they are screwed up, substantially asdescribed and for the purpose set forth.

2. Means for fitting up screw propellers conical shaft,a cylindricalbore formed in the hub following the small base of the conical bore andhaving, a larger diameter than this base so as to form a shoulderbetween the two bores, a tapping in the cylindrical bore by the side ofits outer opening, a nut capable of engaging freely in the cylindricalbore of the hub and screwedupon the threaded end of the shaft so as toabut against the inner shoulder of the hub, a

collar formed upon the front part ofthenut and a cylindrical holethroughout the rear end of the nut, a lock nut having a bore ofsufficient diameter to slip freely over the nut, an. outer screw-threadformed on the front end of this look nut, this thread being arranged toenter the tapped bore of the hub and having a pitch reversed to that 'ofthe tapped nut, a flange or abutment formed on the lock nut" in such amanner as to leave'always a certain amount of play between the front endof the lock-hut-even substantially as described and for the pur- V poseset forth. In testimony whereof I have signed my name to thisspecification.

' AUGUSTE MAIRE.

